<template>
    <el-menu 
        default-active="1-4-1" 
        class="el-menu-vertical-demo" 
        @open="handleOpen" 
        @close="handleClose"
        :collapse="isCollapse"
        background-color="#545c64"
        text-color="#fff"
        active-text-color="#ffd04b">
        <h3>{{ isCollapse ? '后台' : '后台管理系统' }}</h3>
        <el-menu-item @click="goMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{item.label}}</span>
        </el-menu-item>
        <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
            <template slot="title">
                <i :class="`el-icon-${item.icon}`"></i>
                <span slot="title">{{item.label}}</span>
            </template>
            <el-menu-item-group v-for="kidItem in item.children" :key="kidItem.path">
                <el-menu-item @click="goMenu(kidItem)" :index="kidItem.path">{{kidItem.label}}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
    </el-menu>
</template>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
}

.el-menu{
    height: 114vh;
    border-right: none;
    h3{
        color: #fff;
        text-align: center;
        line-height: 48px;
        font-size: 16px;
        font-weight: 400;
    }
}
</style>

<script>
import Cookie from 'js-cookie'
export default {
    data() {
        return {
        };
    },
    methods: {
        handleOpen(key, keyPath) {
            console.log(key, keyPath);
        },
        handleClose(key, keyPath) {
            console.log(key, keyPath);
        },
        // 点击菜单进行路由跳转
        goMenu(item){
            // console.log(item)
            // 当页面的路由与跳转的路由不一致才允许跳转
            if(this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))){
                this.$router.push(item.path)
            }
            this.$store.commit('selectMenu',item)
        }
    },
    computed: {
        // 没有子菜单
        noChildren(){
            return this.menuData.filter(item => !item.children)
        },
        // 有子菜单
        hasChildren(){
            return this.menuData.filter(item => item.children)
        },
        menuData(){
            // 判断当前数据，如果缓存中没有，则在store中获取
            return JSON.parse(Cookie.get('menu')) || this.$store.state.aside.menu
        },
        isCollapse(){
            return this.$store.state.aside.isCollapse
        }
    }
}
</script>

